Hey Roger
I had similar problems with a Lokar in my 460, only in that case, the tube diameter wouldn't fit the passthrough hole in the timing chain housing. I sent it back to Summit with no problems. Now I have to buy a Lokar transmition dipstick to clear space for when I mount my headers. Right now the stock tube goes way out into the manifold area. Lokar seems to be one of the few companies out there with aftermarket options. All in all most of their stuff seems pretty darn good, but expensive. My throttle cable/gas pedal assembly costs more than I want to think about, but worked like a charm!